BE SURE ALL UNITS ARE CORRECT BEFORE SOLVING EQUATIONS!!!!

1. Find the number of moles of a gas under 5.0-atm of pressure in a 3.0-L container at 300.0 K.

2.
Find the final temperature of a balloon that began at 10°C and its pressure changed from 2.5-atm to 9.5-
atm.

3. How many moles of methane are in a 2.5-L container under 3.3-atm of pressure at 350 K?

4.
What's the molar mass of a gas if 10.0 mol are in 4.2-L container at 200 K, 3.3-atm and its mass is
64.0-g?

5. What was the initial temperature in 1.3-L balloon that ended up at 333 K and 0.55-L?

6. How much pressure is on a 4.2-L canister at 200. K containing 1.8 moles?

7. The [H+] of a solution is 3.3 x 10-4, what's the pH of the solution?

8. The pH of a solution is 9.8, what is the [H+] of the solution?
Use the following equation to answer questions 9 and 10 (BFH)
CH3COOH → H+ + CH³COO-

9. Write the equilibrium expression for the reaction.

10. If Keq is 1.8 x 10-5, and the [H+] is 1.5 x 10-9, what's the [CH3COO-]?
Use the following equation for questions 11-13
HF → H+ + F−

11. Write the equilibrium expression for the reaction

12. If the [H+] is 2.5 x 10-2 and the [F-] is 2.52 x 10-2], what's the Ka?